Implement new invalidations ack tracking system

sync/notifier/invalidation_notifier.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // An implementation of Invalidator that wraps an invalidation
 // client.  Handles the details of connecting to XMPP and hooking it
 // up to the invalidation client.
 //
 // You probably don't want to use this directly; use
 // NonBlockingInvalidator.
 
 #ifndef SYNC_NOTIFIER_INVALIDATION_NOTIFIER_H_
 #define SYNC_NOTIFIER_INVALIDATION_NOTIFIER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/non_thread_safe.h"
-#include "base/time/default_tick_clock.h"
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/util/weak_handle.h"
 #include "sync/notifier/invalidation_state_tracker.h"
 #include "sync/notifier/invalidator.h"
 #include "sync/notifier/invalidator_registrar.h"
 #include "sync/notifier/sync_invalidation_listener.h"
 
 namespace notifier {
 class PushClient;
 }  // namespace notifier
 
 namespace syncer {
 
 // This class must live on the IO thread.
-// TODO(dcheng): Think of a name better than InvalidationInvalidator.
 class SYNC_EXPORT_PRIVATE InvalidationNotifier
     : public Invalidator,
       public SyncInvalidationListener::Delegate,
       public base::NonThreadSafe {
  public:
   // |invalidation_state_tracker| must be initialized.
   InvalidationNotifier(
       scoped_ptr<notifier::PushClient> push_client,
       const std::string& invalidator_client_id,
-      const InvalidationStateMap& initial_invalidation_state_map,
+      const UnackedInvalidationsMap& saved_invalidations,
       const std::string& invalidation_bootstrap_data,
       const WeakHandle<InvalidationStateTracker>&
           invalidation_state_tracker,
       const std::string& client_info);
 
   virtual ~InvalidationNotifier();
 
   // Invalidator implementation.
   virtual void RegisterHandler(InvalidationHandler* handler) OVERRIDE;
   virtual void UpdateRegisteredIds(InvalidationHandler* handler,
                                    const ObjectIdSet& ids) OVERRIDE;
   virtual void UnregisterHandler(InvalidationHandler* handler) OVERRIDE;
-  virtual void Acknowledge(const invalidation::ObjectId& id,
-                           const AckHandle& ack_handle) OVERRIDE;
   virtual InvalidatorState GetInvalidatorState() const OVERRIDE;
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) OVERRIDE;
 
   // SyncInvalidationListener::Delegate implementation.
   virtual void OnInvalidate(
       const ObjectIdInvalidationMap& invalidation_map) OVERRIDE;
   virtual void OnInvalidatorStateChange(InvalidatorState state) OVERRIDE;
 
  private:
   // We start off in the STOPPED state.  When we get our initial
   // credentials, we connect and move to the CONNECTING state.  When
   // we're connected we start the invalidation client and move to the
   // STARTED state.  We never go back to a previous state.
   enum State {
     STOPPED,
     CONNECTING,
     STARTED
   };
   State state_;
 
   InvalidatorRegistrar registrar_;
 
   // Passed to |invalidation_listener_|.
-  const InvalidationStateMap initial_invalidation_state_map_;
+  const UnackedInvalidationsMap saved_invalidations_;
 
   // Passed to |invalidation_listener_|.
   const WeakHandle<InvalidationStateTracker>
       invalidation_state_tracker_;
 
   // Passed to |invalidation_listener_|.
   const std::string client_info_;
 
   // The client ID to pass to |invalidation_listener_|.
   const std::string invalidator_client_id_;
 
   // The initial bootstrap data to pass to |invalidation_listener_|.
   const std::string invalidation_bootstrap_data_;
 
-  // TODO(akalin): Clean up this reference to DefaultTickClock. Ideally, we
-  // should simply be using TaskRunner's tick clock. See http://crbug.com/179211
-  base::DefaultTickClock tick_clock_;
-
   // The invalidation listener.
   SyncInvalidationListener invalidation_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(InvalidationNotifier);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_INVALIDATION_NOTIFIER_H_